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finetune.py
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import torch
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from transformers import AutoModelForCausalLM, AutoTokenizer, TrainingArguments, Trainer
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from peft import LoraConfig, get_peft_model
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from datasets import load_dataset
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# Load model and tokenizer
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model_name = "TinyLlama/TinyLlama-1.1B-Chat-v1.0"
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tokenizer = AutoTokenizer.from_pretrained(model_name)
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# Use 4-bit quantization to save RAM
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model = AutoModelForCausalLM.from_pretrained(
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model_name,
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load_in_4bit=True, # ✅ Reduce VRAM usage
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device_map="cpu" # ✅ Force CPU usage
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)
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# Apply LoRA configuration
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lora_config = LoraConfig(
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r=8, # Low-rank dimension (small)
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lora_alpha=32,
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lora_dropout=0.05,
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bias="none",
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task_type="CAUSAL_LM" # For TinyLlama (Chat models)
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)
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model = get_peft_model(model, lora_config)
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# Load dataset (Example: "Hello world" text)
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dataset = load_dataset("Abirate/english_quotes", split="train[:1000]")
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def tokenize_function(examples):
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return tokenizer(examples["quote"], padding="max_length", truncation=True, max_length=128)
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tokenized_datasets = dataset.map(tokenize_function, batched=True)
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# Training arguments
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training_args = TrainingArguments(
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output_dir="./tinyllama_lora",
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per_device_train_batch_size=2, # ✅ Small batch size for CPU
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num_train_epochs=1,
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save_steps=10,
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logging_steps=10,
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optim="adamw_torch", # ✅ Better optimizer
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save_total_limit=1,
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)
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# Trainer
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trainer = Trainer(
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model=model,
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args=training_args,
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train_dataset=tokenized_datasets
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)
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# Start training
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trainer.train()
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# Save the fine-tuned model
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model.save_pretrained("tinyllama-lora-finetuned")
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tokenizer.save_pretrained("tinyllama-lora-finetuned")
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print("✅ Fine-tuning complete! Model saved.")
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